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Electronics Basics
Start here if you're new to electronics. These guides cover the fundamental quantities and components — voltage, current, resistance, and the parts you'll see in almost every circuit — explained in plain language with practical examples.
11 articles
Resistance
Learn what electrical resistance means, apply Ohm’s law, calculate series and parallel networks, estimate resistor power, and measure resistance correctly.
Inductor
Understand inductance, magnetic energy storage, reactance, datasheet ratings, switching converters, and flyback protection for inductive loads.
Ohm's Law
Understand Ohm’s law with clear formulas, worked calculations, LED resistor sizing, measurement guidance, limitations, and practice questions.
Voltage
Learn what voltage means, how DC and AC differ, how to measure voltage safely, and how voltage behaves in circuits and microcontroller projects.
Current
Learn what electric current measures, how to calculate it with Ohm’s law, how current behaves in series and parallel circuits, and how to measure it safely.
Diode
Understand diode polarity, forward and reverse bias, rectification, LED resistors, flyback protection, diode testing, and component selection.
LED
Learn LED polarity, calculate current-limiting resistors, wire LEDs to Arduino or ESP32, use PWM safely, and troubleshoot common LED faults.
MOSFET
Understand MOSFET terminals, logic-level gate drive, switching losses, inductive-load protection, datasheet ratings, and troubleshooting.
Power
Learn electrical power and energy, calculate watts and watt-hours, understand component heating and converter efficiency, and build a power budget for electronics.
Transistor
Learn BJT and MOSFET fundamentals, low-side switching, base-resistor calculations, gate-drive requirements, inductive-load protection, and safe transistor selection.
Capacitor
Understand capacitor operation, capacitance codes, common types, RC timing, filtering, safe testing, and how to select replacements for electronics projects.